SOLUTION: I can't figure out this question, (-10+a)/30=-1 This is where I got so far, -10/30 + a/30 = -1, -1/3 + a/30 = -1, -1/3 +1 = a/30, 2/3 = a/30, a = 2/3 (30), a = 20, but the answ

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Question 766050: I can't figure out this question, (-10+a)/30=-1
This is where I got so far, -10/30 + a/30 = -1,
-1/3 + a/30 = -1, -1/3 +1 = a/30, 2/3 = a/30,
a = 2/3 (30), a = 20, but the answer is -20.
Answer by solver91311(24713) (Show Source):
You can put this solution on YOUR website!

Simple sign mistake. You said:

which was all ok, but then you said:

But you should have said:

And you will find that it works out to the correct answer from here.

Having said that, I'd like to point out that you did a great deal of extra work.

Start over from the beginning:

But this time as a first step, multiply both sides by 30:

Then just add 10 to both sides:

as expected.

Lesson: Things usually get simpler if you can find a multiplier that gets rid of all your denominators.

John

Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it